The branch stable/13 has been updated by mm:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=014f9aa8218a66ef1e412ad37a75b8da5ab9d65e

commit 014f9aa8218a66ef1e412ad37a75b8da5ab9d65e
Author:     Martin Matuska <m...@freebsd.org>
AuthorDate: 2021-06-16 01:47:02 +0000
Commit:     Martin Matuska <m...@freebsd.org>
CommitDate: 2021-06-16 01:56:19 +0000

    zfs: unbreak stable/13 build on i386 after b0c251b0d
    
    The build was broken because upstream merged e76373de7 (author: mav)
    without fef8bd41f from openzfs/zfs/master into openzfs/zfs/zfs-2.1-release.
    
    Temporary fix until upstream decides a way to solve this problem.
    
    Patch by:               mav
    Differential Revision:  https://reviews.freebsd.org/D30783
    
    (direct commit)
---
 sys/contrib/openzfs/lib/libspl/asm-i386/atomic.S | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/sys/contrib/openzfs/lib/libspl/asm-i386/atomic.S 
b/sys/contrib/openzfs/lib/libspl/asm-i386/atomic.S
index 7a574b0d1729..c8a6c78b5fa8 100644
--- a/sys/contrib/openzfs/lib/libspl/asm-i386/atomic.S
+++ b/sys/contrib/openzfs/lib/libspl/asm-i386/atomic.S
@@ -762,6 +762,7 @@
        SET_SIZE(atomic_swap_32)
 
        ENTRY(atomic_swap_64)
+       ALTENTRY(atomic_store_64)
        pushl   %esi
        pushl   %ebx
        movl    12(%esp), %esi
@@ -776,8 +777,20 @@
        popl    %ebx
        popl    %esi
        ret
+       SET_SIZE(atomic_store_64)
        SET_SIZE(atomic_swap_64)
 
+       ENTRY(atomic_load_64)
+       pushl   %esi
+       movl    8(%esp), %esi
+       movl    %ebx, %eax
+       movl    %ecx, %edx
+       lock
+       cmpxchg8b (%esi)
+       popl    %esi
+       ret
+       SET_SIZE(atomic_load_64)
+
        ENTRY(atomic_set_long_excl)
        movl    4(%esp), %edx
        movl    8(%esp), %ecx
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